Apart from Semarule (No. 1) there are elsewhere within the Gaborone granite facies that are peralkaline, although the distribution of these rocks is not well known.
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The Semarule syenite complex lies within one of the large granite plutons in southeastern Botswana that are known collectively as the Gaborone granite. Semarule is post-granite in age but syenites and granites are complexly intermingled as illustrated by the map of King (1955, fig.